Mold



F. KURATH MOLD Oct. 4, 1932.

Filed April 22. 1929 molded article. 'I i It fis anobject ofthe 4 A outl the above purpose by mounting the pair 'Patented Oct. 4, 1932 UNI'I'EDg STATES; v4PAT.ENT F'FICE FRANZ Konami, or CHICAGO, ILLINOIS, Assrenoia r.ro ECONOMY FUsnriNn Manufac- TUBING CO., OF CHICAGO, ILLINOIS, A CORPORATION 0F NEW YORK MOLD y Application inea' Aprii 22,

1 This invention relates'to improvements in v apparatus for performing molding loperations and particularlyto apparatus l for molding material such as'phenoliccondensation products that-will -liow-to take the shape of the mold upon the applicationvof. mold- Molds as commonly constructed comprise either the flash typey mold in which there'gare v. a pair of cooperating mold blocks which are pressed together lto form the article, or the positive type of mold which consists of 'a body, usually having an ejector yin its base to removethe formed article, and a cooperating plunger which applies the molding pressure. Certain sliapesof articles cannoty be reficiently molded by either .of the usual types Jof molds. Thus articles ywhich are deep and hollow with threads or bosses, etc.

` on their exteriors,require split mold parts heldin a 4chase or retaining ring and the application ofpressnre by a plunger. 'lhe operation of molding .with molds of this form lisrendered slow andeXpensive because of 2 the labor required in "assembling the mold prior tothe application of the molding pressurevby the plunger." Therefore, ithas been Vpreviously proposed to vuse Awhat is called an angle press in which the'split Vmolded parts are Vfirst closedl by means of a :hori- Zontal ram and the plungeris then actuated by a vertical ram and applies the moldingy pressure. vAngle presses arey relatively expensivey equipment and therefore -it` is desired to construct the moldingequipnient so that articles of the type mentioned may be molded .in the usual .plunger type presshaving'a single ram. I

1 It is the purpose of my invention yto .pro-V rj vide molding equipment inwhich a'zpair` of Y cooperating mold blocks are pressedtoclosed *position by the pressureapplied by the` plunger which forms the interior of the .inventionV to carry oficooperating mold blocks byk means of toggle links eXtendiiigfrom a fixed frafinewhere-V bythe upward movementof the ejector will separate the niold=,blocks and allow thev 1929. seriai'iro. 356,936. d

formed article to be removed, while, upon downward movement of the ejector, the co-v operating mold blocks will gravitally swing to'closed position and yupon the downward movement of the plunger, the mold blocks will' be forced into tightly closedrelation during the molding operation.

Itis also -an object of my invention to carry out the principles above mentioned whereby eithersingle articles or a plurality of articles may be molded in one operation in the ordinary plunger type press.

Further objects and advantages of my iniproveinents will be more readily apparent from the following` descriptiontaken in con-A nection with 'the attached drawing in which- Figure l is a vertical sectional elevation through the molding equipment and illustrates the formation of a vase.

Figure 2 is a similar 'sectional elevation vthrough molding equipment embodying my parent that the shape ofthe plunger may be modied in. accordance with the particular article which it is desired to mold. The plunger 13 is provided with suitable cored openings 14; through which heating or cooling fluid maybe passed through the inlet and outlet pipes 15 and 16. An opening 17 in d the fixed bed receives aplunger 18 tothe to y of which is secured an ejector disk Y19. f bottom `inoldpart 20 may be fiXedly secured to thedisk 19 or, asshown, may include a' central recess 21 which receives a centering pin 22upon the disk 19. Thus the bottom part may freely rest upon the disk 19 and will be allowed to have limited movement in orderfto closely cooperate with the moldino' blocks 23-,24a The molding blocks 23-2 "U Yare Vformed with suitable impressions uponV their inner surfaces to cooperate with the Y i plunger 13, and the botton1'20 to form the molded article.4 l Y c l VvIn Figure 1, the 1nY ldingv blocks v are in closed position .and it should be noted that the bottom Q is provided with a laterally extending stepped edge which vis received in. suitable recesses formed mold blocks 234-24. y. -1 Y Y Instead" of* closing lthe mold blocks by means of a horizontalram, as is necessary an'anglepress, I have provided means which# in Vthe cooperating will support the .blocks in such amanner that theyvwill normally swingtogether due tothe vforce of gravityvand the. pressure of the plunger 13 will force the vmold blocks into Y tightly 'closedV relation during the: Vmolding f' operation. l,therei ore, provide a surrounding frame. 26 ywhich yis adapted Vto seat upon l* the fixed bed-110 and is provided withhori-k Y`zontally extendingv pivot shafts 27, 28,1: 29,

i and 80. y' Thus-the pivot shaits27 and'28are *mounted inV one side of `the iframe `26 and are parallelly arranged butv vertically. spaced.

v Toggle `links 31, 32, 33 an'df34 are supported Y v by the pivot shafts. Themoldblocks 234-24 are provided with the recesses 155-35 which are yclosed by the thrust plates 36 and` 87 to -orm circulating Vspaces for the passage of he'atin'gfor cooling-duid. The plates 36 andi f 37are attachedloybolts (not shown) andare formed with pins 38 which are received in corresponding, recesses of themoldv blocks .2S-24r To the forward Vand rearward sides I ofthe mold blocks, together' with the at-,

tached plates, are ,securedV supporting plates 40 which include pins 41 which are adapted ltobe. receivedV in elongated openings 42 of ythe toggle .links 31,."32 and 33. The inner end ofeachv oi'the toggle links iscurved "about the Yaxis ofthepins 41 as acenter, fas

indicatedl at 43,'1he side thrust plates 36k .and37,which are attached to the ,molde blocks,

are-formed with cut-out portions. 44 Vwhich receive the curved endsrof the t'ogglejlinks.-

'l v' Fromahe position shown in .Figure 1, it

,is apparent'lthat the toggle,` links are maintained in positions upwardly inclinedtowards thelplu'nger 13 so that thefpressure upon the plunger ,13 will producea corresponding ref` actingthrust inthe toggle members which willproduce horizontal components tending Y. topress the mold blocks 2,3-#24-togtightly arj'clggd positions. VVrlhepressure, which is ref ceived bythe togglev links, is transmitted: 4through, the cooperating gbearing surfaces of thecureved ends of the toggle'` linksy and the jcut-joutjportions 44 of the moldV blocks. f By thev provision of elongated openings42, itis apparent that none lof. the yheavy ypressure will fall upon `the relatively small supporting v- The operation willvrbe readilyfaploarent. The molding composition' indicatedat 45V is placed in theV opening between thel mold blocks 23-24 and the botto-m 2OY and the application of the molding Ypressure will cause therplungerV to form'the interior 'or the articlewhile the outerv surfacev of?A the article willlbepressed to shape by the` moldA blocks S23- 24 which will-hek held in tightly closed position'by vthe components of lhorizontalV pressure transmitted by the toggle'links.

moldblo'cks 223-124 are separated hy upward movement of the ejector plunger k18 which causes swinging. jifnovements e of the mold blocks about their supportingpivots; The

.molded article may` then lbe readily removed from the bottcinQO.- During theretractive movement of the plunger 13, the `moldfblocks may, Yit' so desired, be,preventedfromy upf ward movement bythe provisionv of suitable means thus causing the plunger to separate from the' formed article; It [should be noted that bytproviding pairofjtoggle links for eachmold block they will'pbe maintained in "fUpon completionfof the` .molding operation, the plunger 13, is retracted'and the v `vertical positions during theswinging moveif desifaae 'santafe eigenste ming, Y

ure 1 couldbeembodiedin apparatus for molding a plurality of articles at the same VViframe 50 issecfured an. upstanding. post 51.' The `framelr() is falso providedV ,with a pair of openings 52-53f throughy which extend thei ejector rods 574-55V which. support at their 'upper ends, anejectorfplate having a guiding opening 57fwhich receives lthe pos-trV preferably `non-rotatably slidable v'thereon is ablock `58 .which has'mold impressions on its' opposite faces. cooperating with mold impressions /formedlinthe mold blocksl 59 and 60. Thus,"as shown in Figure 2,'Jthe` moldV block 59 will 'cooperate with `thecengtral block 58 to form one article while thef-m'old block60 will k ':o ')peratewith theotherYs-ide ofthe central block 58 to form another article. There- 4fore, Iprovide a'y pair of plungers'6l-62v -whichare koperated-hy the upper pressingl head 63.1 As before', the Youter-f sides off the mold blocks 594-60 are formed withfcores covered by ithe'plates (S4-65.* "A1.single toggle link@ 66 is utilized to" transmit the thrustuponthe moldr block 59 ywhile the other mold block 60 is provided with a toggle link 67. .The toggle links 66'andf67V areu `pivoted onk the .pins 69 mounted inthe frame e 51. Also guided,` by the centerk post -50 andiV led zontal components which will tend to press the outermold blocks into closing relation with the intermediate mold block 58. The

pressure upon the toggle links will be trans--n mitted by the rounded ends and will not fall upon thepins 69 or 7 2 which merely serve:

to prevent displacement of the parts upon the separating movement thereof.

In order to provide for a perfectly parallel movement of the outer mold blocks relative to the intermediate block 58 which slides on the post, I may utilize a cooperating pin and guide opening, such as shown in Figure 2, in which guiding pins 70 are secured to the central block 58 and received by the openings 7l formed inthe outer blocks 59-60. It should Y also be apparent that the ejector disk 56 will tend to maintain the mold blocks in correct parallel arrangement.

The molding operation takes place substantially as before in that'the molding com-v position is placed in the `die openings formed` by the cooperating mold blocks and, upon downward movement of the plungers 61-62',

the molding pressure is app-lied to cause they molding composition to iiow and form Vthe articles, After completion of Vthe molding operation, the plungers are retracted and by vupward movement of the ejector rods, the molds are opened. Thus by a construction such as shown in Figure 2 it is possible to provide parallel lines of die openings by efr-i i Y tending the width of the mold blocks to allow a plurality of impressions. y

Various modifications and changes may be made inthe particular embodiment of the molding equipment by those skilled in the art without departing from the spirit of my invention as,Y expressed in the appended claims. Y

' ward movement thereof, means for applying molding pressure inay downward direction to said `mold blocks, said Vmolding pressure being'transmitted throughV said cooperating n members and producing transverse components of'pressure tending to force saidV mold blocks into tightly closed relation in order tol form a molded article, means to move-said mold blocks in an upward direction whereby said cooperatingy members cause relative transverse separation of said mold blocks in order to permit removal of a molded article, said cooperating members comprising toggle links extending between Said fixed frame and said mold blocks.

2. Apparatus for performing molding operations comprising relatively separable `mold blocks, a fixed frame, toggle links eX- tending between said fixed frame and said mold blocks, supporting pins carried by said `mold blocks, said toggle links having elongated openings adapted to receive said supporting pins, said toggle links having rounded ends adapted to bear against corresponding socketed portions of said mold blocks, means for applying molding pressure in a downward direction to said mold blocks, said molding pressure being transmitted through the rounded bearings ends of said toggle links and producing transverse components of pressure tending to force said mold blocks into tightly closed relation in order to form the molded'article, and means for moving said mold blocks in upward directions whereby the connection between said supporting pins and said toggle links will cause said mold blocks to transversely separate in order to permit removal of a molded article.

3. Apparatus for performing molding operations comprising a plurality of relatively separable mold blocks, a fixed frame, pivoted members supporting said mold blocks on said frame and permitting gravital movement of said mold blocks into closed relation, means for guiding the movement of said mold blocks in parallel relatiommeans for applying pressure in a downward direction to said mold blocks to force said mold blocks into tightly closed relation, and means to move rsaid mold blocks in an upward direction to produce separation thereof and permit removal of a molded article.V v

4. Apparatus for performing molding operations comprising a plurality of vertical relatively separable mold blocks, a fixed frame, means extending between said fixed frame and said mold blocks adapted to maintain said mold blocks in substantially parallel relation during movement thereof, means for applying pressure in a downward direction upon said mold blocks to force said mold blocks into tightly closed relation, vertically movable means for opening said mold blocks `and a bottom mold'block carried by said last-named means free to have relative movement with respect thereto to center itself with krespect to rsaid first-mentioned mold blocks.

Signed at Chicago, Illinois, this 16th day of April, 1929.

FRANZ KURATI-I.

Vso 

